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1918 Rather Wet. A Cool Sunmer and Autumn.
In the year that an estimated 25 million people died in the 'Spanish Flu' pandemic, Russia switched from the Julian to the Gregorian Calendar and moved it's Capital from Petrograd to Moscow; and World War One ended with an agreement signed in a railway carriage near Compiegne (France).
Weather Notes:-
17th May - Severe thunderstorms, with heavy hail, affected the Midlands and parts of eastern England. Several places had over 50mm of rain in one hour. An area north of Luton (Bedfordshire) was particularly badly hit.
16th/17th July - Severe thunderstorms over Surrey and parts of south London produced hailstones the size of pigeon eggs near Kenley (Surrey), and Bermondsey (Southeast London) had nearly 53mm of rain in 30 minutes. 
15th September - In this exceptionally wet month, Douglas (Isle of Man) recorded over 120mm on this day.

In London...
 Temperature 10.3°C   Rainfall 712.5 mm   Warmest  29.1°C
 Sunshine 1458 hrs      Coldest  -6.6°C

January Sunny and rather wet with near normal temperatures
 Mean Temperature   4.1°C    
 Monthly Highest  12.6°C   Total Rain  75 mm
 Monthly Lowest  -6.6°C  Total Sun  58 hrs

The first half of January was mostly cold or very cold with frosty nights and some snow. On the 8th, the temperature only reached minus 1.0°C., and on the following night the minimum temperature was below minus 6°C. On the 15th, snow turned to rain, and totalled over 20mm. A thaw then set in as milder air spread from the west. On the 24th, the temperature rose close to 13°C., but on the last day of the month it became foggy with very low visibility.

February - Very mild and dry with near normal sunshine.
 Mean Temperature   6.5°C    
 Monthly Highest  14.0°C   Total Rain  21 mm
 Monthly Lowest  -4.6°C  Total Sun  63 hrs

Dense fog occurred on the first day of the month and the maximum temperature was only 2.8°C. It then became  milder, but was often rather cloudy and misty. During the second week it became mild, but after mid month temperatures fell closer to normal for a while with some sunny days and frosty nights. During the last week it became very mild, and on the 23rd the temperatrure reached 14°C. However, it became unsettled, with nearly 7mm of rain falling on the 24th.

March - Dry with above average sunshine and near normal temperatures.
 Mean Temperature   6.6°C    
 Monthly Highest  20.0°C   Total Rain   23 mm
 Monthly Lowest  -0.7°C  Total Sun  126 hrs

The early part of March was cold and wintry at times. The temperature on the 3rd failed to rise above 2.8°C. Sunny spells helped to lift daytime temperatures during the second and third week, although nights were rather cold with temperatures close to freezing. During the fourth week it became warmer, and the temperature on the 24th reached 20°C. There were several sunny days, but the end of the month was wet, with over 9mm of rain falling on the 30th. 

April - Very dull, wet and cold.
 Mean Temperature   7.3°C    
 Monthly Highest  17.6°C   Total Rain  80 mm
 Monthly Lowest  -1.3°C  Total Sun  85 hrs

This was a very cyclonic month with skies frequently cloudy, and often with showers,  or longer spells of rain, falling. It was mostly cold, although the extensive cloud cover prevented any air frosts from occurring after the 3rd. Sleet or snow fell on 5 days during the month, and on the 16th the temperature only rose to 5.3°C. On the 21st, over 25mm of rain fell, but during the last 10 days of April it became sunnier and warmer. On the 25th, the temperature exceeded 17°C. 

May - Warm with above average sunshine and near normal rainfall.
 Mean Temperature  13.8°C    
 Monthly Highest  27.3°C   Total Rain   46 mm
 Monthly Lowest   5.4°C  Total Sun  222 hrs

The first half of May was rather unsettled, and occasionally cool and cloudy. The temperature on the 1st only reached 9.2°C. On the 7th, over 12mm of rain fell, but after mid month it became warmer and fairly settled. At the end of the third week there were several days of unbroken sunshine, and on the 21st the afternoon temperature exceeded 27°C. There were further spells of sunshine during the fourth week but the weather became more changeable and less warm.

June - Cool and dry with above average sunshine.
 Mean Temperature  14.2°C    
 Monthly Highest  25.1°C   Total Rain   29 mm
 Monthly Lowest   4.8°C  Total Sun  232 hrs

The temperature reached 25°C. on the 2nd, but generally the month was rather cool with winds predominantly from between northeast and northwest. There were many clear and cool nights, and although there were sunny mornings, the afternoons were often rather cloudy, and sometimes showery. On the 14th, over 8mm of rain fell, but showers were mainly light. On the 17th, after an overnight minimum below 5°C., the temperature only rose to 16.2°C.

July - Very wet and rather cool with below average sunshine.
 Mean Temperature  16.7°C    
 Monthly Highest  25.8°C   Total Rain  121 mm
 Monthly Lowest   8.1°C  Total Sun  182 hrs

This was a very thundery month with thunderstorms reported on 10 separate days. During the first week, however, the weather was mainly fine, and it was warm at times. The maximum temperature on the 1st was close to 26°C. The second week was unsettled, and on the 11th, nearly 27mm of rain fell and the temperature only rose to 16.5°C. Some severe thunderstorms occurred during the third week, and the rest of the month was changeable, and often rather cool.

August - Dry with temperatures and sunshine slightly below average.
 Mean Temperature  16.9°C    
 Monthly Highest  29.1°C   Total Rain   35 mm
 Monthly Lowest   8.4°C  Total Sun  183 hrs

Temperatures were not far from average during the first 2 weeks of August, although there were a few rather cool days early in the month. The weather was fairly unsettled, and on the 3rd, nearly 10mm of rain fell. However, rainfall amounts were generally small. During the third week it became mainly dry and warm, and the temperature on the 22nd exceeded 29°C. It then became cool and changeable, and on both the 27th and 31st the temperature only reached 17.3°C.
September - Very wet and cool with slightly above average sunshine.
 Mean Temperature  13.3°C    
 Monthly Highest  22.2°C   Total Rain  145 mm
 Monthly Lowest   3.1°C  Total Sun  149 hrs

The first day of the month was sunny, otherwise September was very changeable, and frequently windy, as a series of Atlantic frontal systems crossed the British Isles bringing bands of heavy rain. Although sunny spells occurred between rain-bands, temperatures were mostly well below average. However, on the 7th, the maximum reached 22°C. On the 18th, over 34mm of rain fell, and in an unusually cool end to the month, the highest temperature on the 29th was only 9.1°C.

October - Dry, dull and rather cold.
 Mean Temperature   9.7°C    
 Monthly Highest  16.4°C   Total Rain  29 mm
 Monthly Lowest   0.8°C  Total Sun  75 hrs

The opening fortnight of October was mainly rather mild and changeable. There were sunny spells, and on the 6th the temperature rose above 16°C. Rainfall amounts were small, but nearly 5mm was measured on the 11th. It became colder around mid month, and although a clear night on the 13th/14th allowed a ground frost to form, the weather was mostly cloudy and damp. On the 18th, the temperature only reached 8.6°C., but the end of the month was milder.   

November - Rather cold with below average rainfall and near normal sunshine.
 Mean Temperature   6.0°C    
 Monthly Highest  14.5°C   Total Rain  53 mm
 Monthly Lowest  -3.0°C  Total Sun  54 hrs

The beginning of the month was very mild and the maximum temperature on the 1st was above 14°C. On the 3rd, over 17mm of rain fell at it then became cooler. There was a frost on the night of the 6th/7th, and there were further frosty nights during the second and third weeks. Although the weather was rather changeable, there were several bright and sunny days. On the 20th, the temperature only reached 3.7°C., but towards the end of the month it became milder.

December - Very mild and dull with near normal rainfall.
 Mean Temperature   7.9°C    
 Monthly Highest  14.5°C   Total Rain  53 mm
 Monthly Lowest  -1.7°C  Total Sun  29 hrs

The first 3 weeks of December were mostly mild or very mild and changeable. Maximum temperatures were mostly above 10°C., and the high on the 3rd was above 14°C. Rain and drizzle fell frequently, but it was mainly light, although nearly 10mm of rain was measured on the 10th. There were a few sunny days, and around Christmas it turned colder for a while with chilly nights. On the 25th, after a maximum temperature of only 4.5°C. the following night was frosty.

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